Two icy moons of Jupiter, though neighboring and of similar size, exhibit radically different internal structures. A new ...

Most meteorites that have reached Earth come from the asteroid belt between Mars and Jupiter. But we have 1,000 or so ...

Here's What'll Happen When Plate Tectonics Grinds to a Halt. A new study says we may only have another 1.45 billion years to enjoy the dynamic action of Earth’s geologic engine.